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The LT5 is a carbon making machine. We have seen many engines now coming in with incredible carbon build up on the valves and passages. In many cases, this build up effects the amount of cranking time necessary for the engine to fire. This occurs when the fuel in sprayed into the valve area and is soaked up by carbon deposits on the valve neck.


Much the same as a charcoal lighter is absorbed by the charcoal, the fuel is absorbed immediately and therefore does not get into the combustion chamber for several seconds. This is mostly noticeable during a hot start but can also effect the cold start. In some cases, we've seen the carbon buildup so extensive that the secondary throttle plates cannot even open. Needless to say, the owners probably didn't even know it.

There is no easy way to de-carbon an LT5 without physical dis-assembly of the engine. Therefore, it is crucial that you avoid allowing these deposits to form in the first place. How? Well, the LT5 is like a race horse that needs to be run and run hard. Good gas and "occasional" high rpm operation are the only known precautions against carbon buildup.

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